A kind of atomic clock 1pps time synchronization method and system

Abstract

An embodiment of the present application provides a 1PPS time synchronization method for an atomic clock. The steps of the method include: capturing the 1PPS pulse signal of the atomic clock; if the capture fails, enter the 1PPS failure hold state; It is a pseudo 1PPS pulse signal; if the captured signal is a pseudo 1PPS pulse signal, recapture the 1PPS pulse signal; if the captured pulse signal is not a pseudo 1PPS pulse signal, perform 1PPS time synchronization based on the PID algorithm. The technical solution described in this application eliminates the interference of the false 1PPS pulse signal on the synchronization process by judging and identifying the captured 1PPS pulse signal, and at the same time, overcomes the long-term aging drift problem of the atomic clock through 1PPS failure maintenance, thereby improving the frequency stability of the atomic clock and frequency accuracy.

Description

technical field [0001] This application relates to the application field of 1PPS signal synchronization and frequency calibration, and in particular to an atomic clock 1PPS time synchronization method and system suitable for autonomous navigation terminal equipment and high-precision time synchronization and maintenance equipment. Background technique [0002] As a secondary frequency standard, the chip atomic clock has good long-term frequency stability. However, its frequency accuracy is 1E-10, which is still lower than the application requirements, and there are long-term aging drift problems. In the prior art, methods such as the time-amplitude conversion method and the TDC method are used to measure the time error data to calibrate the frequency accuracy of the chip atomic clock. However, due to the limitations of the existing method of measurement, it is impossible to meet the 1PPS of the chip atomic clock Synchronization and frequency calibration requirements. To en...

AI Technical Summary

Problems solved by technology

However, its frequency accuracy is 1E-10, which is still lower than the application requirements, and there are long-term aging drift problems

In the prior art, methods such as the time-amplitude conversion method and the TDC method are used to measure the time error data to calibrate the frequency accuracy of the chip atomic clock. However, due to the limitations of the existing method of measurement, it is impossible to meet the 1PPS of the chip atomic clock Synchronization and Frequency Calibration Requirements

To ensure the 1PPS synchronization and frequency calibration accuracy requirements of the chip atomic clock, it is necessary to use a primary frequency standard to calibrate it, which is not conducive to practical applications

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